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arXiv 1211.2012physics.chem-phcond-mat.mtrl-scicond-mat.other
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含时交换关联势中的普适动力学步

Universal Dynamical Steps in the Exact Time-Dependent Exchange-Correlation Potential

Peter Elliott, Johanna I. Fuks, Angel Rubio, Neepa T. Maitra

摘要:

我们表明,确切的交换相关势的时间依赖的密度泛函理论显示动态的步骤结构,具有空间非本地和时间非本地的密度依赖。使用一维两电子模型系统,我们说明了这些步骤的一系列非平衡动力学的情况下相关的光化学/物理过程的建模:非稳态的无场演化,共振局部激发,共振完整的电荷转移,和演化下的任意字段。在通常的近似中缺乏这些步骤会产生不准确的动态,例如预测更快的动态和不完整的电荷转移。

英文摘要:

We show that the exact exchange-correlation potential of time-dependent density-functional theory displays dynamical step structures that have a spatially non-local and time non-local dependence on the density. Using one-dimensional two-electron model systems, we illustrate these steps for a range of non-equilibrium dynamical situations relevant for modeling of photo-chemical/physical processes: field-free evolution of a non-stationary state, resonant local excitation, resonant complete charge-transfer, and evolution under an arbitrary field. Lack of these steps in usual approximations yield inaccurate dynamics, for example predicting faster dynamics and incomplete charge transfer.

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